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Finding the Fourth Proportional to 409.25, 564.86 and 261.86

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Solution

The fourth proportional to 409.25, 564.86 and 261.86 is: 361.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.25 : 564.86 = 261.86 : x
  2. Step 2: Convert to fraction form
    409.25/564.86 = 261.86/x
  3. Step 3: Cross multiply
    409.25x = 564.86 × 261.86
  4. Step 4: Simplify right side
    409.25x = 147,910.11
  5. Step 5: Solve for x
    x = 147,910.11/409.25
  6. Step 6: Final answer
    x = 361.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.